Developing Algorithms Using ArrayLists

AP Computer Science A· difficulty 3/5

ArrayList<Integer> a = new ArrayList<>();
a.add(1);
a.add(2);
ArrayList<Integer> b = new ArrayList<>();
for (int x : a) b.add(x);
b.add(99);
System.out.println(a.size() + " " + b.size());

What is printed?

A
$2 3$
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B
$1 2$
C
$2 2$
D
$3 3$

Explanation

b is a separate ArrayList copy, so adding to b does not affect a. Sizes are 2 and 3.

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